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RE: maxconcurrency and active sessions

From: Yasin Baskan <>
Date: Thu, 18 Jan 2007 17:00:22 +0200
Message-ID: <083667B535F3464CA0DD0D1DAFA4E3760C46E626@camexc1.kfs.local>

I did not test this but this may be related to autonomous transactions if you use them. If your session has an active transaction and you start an autonomous transaction, you have 2 concurrent transactions from the same session.

[] On Behalf Of LS Cheng Sent: Thursday, January 18, 2007 4:42 PM To:
Cc: oracle-l
Subject: Re: maxconcurrency and active sessions

That makes things even worse, from v$undostat it constantly shows maxconcurrency over 50 however v$session never shows more than 35 concurrent active sessions. shouldnt the opposite be expected?

On 1/18/07, Powell, Mark D <> wrote:

>> if maxcouncurrency seens in v$undostat is equal to the number of
ACTIVE sessions shown in v$session <<

No. An active session as shown in v$session does not have to be performing DML but could be busy querying.

There is a difference between the number of concurrent sessions and the number of concurrent transactions.

[] On Behalf Of LS Cheng

	Sent: Thursday, January 18, 2007 8:14 AM
	To: oracle-l
	Subject: maxconcurrency and active sessions


	I was wondering if maxcouncurrency seens in v$undostat is equal
to the number of ACTIVE sessions shown in v$session and are NOT backkground processes?

        I am trying to determine a system concurrency, usually I watch number of active sessions but I am considering using maxconcurrency.




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Received on Thu Jan 18 2007 - 09:00:22 CST

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